Blow-off valve



J. F. MATTERN AND e. M. STONER.

BLOW-OFF VALVE APPLICATION FILED JULY 2, I9l9.

1,358,968, Patented Nov. 16, 1920;

WITNESSES J. F. MATTERN AND G. M. STONER. I

BLOW-OFF VALVE.

' A P P L I C A T 0 N F l L E D J U L Y 2 I 9 I 9.

1 ,358,968, Patented Nov. 16, 1920.

2 EEEEEEEEEEEE 2.

. 415W". A v

lii i i i 18 ang UNITED STATES PATENT OFFICE.

JOHN F. MATTERN, 0P WILKINSBURG, AND GEORGE M. STONER, 0F PITTSBURGH PENNSYLVANIA, ASSIGNORS TO ELLIOTT COMPANY, OF PITTSBURGH, PENN- SYLVANIA, A CORPORATION OF PENNSYLVANIA.

BLOW-OFF VALVE.

Specification of Letters Patent.

Patented Nov. 16, 1920.

Application filed July 2, 1919. Serial No. 308,199.

To all whom it may concern:

Be it known that we, JOHN F MATTERN and Gnonon M. STONER, both citizens of the United States, and residing, respectively, at Wilkinsburg and Pittsburgh, in the county of Alleghenyand State of Pennsylvania, have invented a new and useful Improvement in Blow-Oil? Valves, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification.

The present invention relates broadly to valves, and more particularly to blow-off valves adapted for 'use'in connection with steam boilers and the like.

The principal object of the present invention is to provide av valve with means for cleaning the same each time the valve, is operated.

A further object of the invention is to so construct a valve of this naturethat the accumulation or deposit of sediment and the like above the valve is removed during each operation of the valve.

A further object of this invention is to construct a blow-off valve having by-passes or relief passages so formed therein that upon the initial opening movement of the valve :the pressure within the boiler to which the same is connected is made available to clean the portion of the casing above the valve. and continued opening movement of the valve establishes a direct connection between the inlet and outlet passages ofthe valve. I

A still further object of the invention is to provide a valve having a jet opening and a pa sa e nt rse i e t n e facilitate and insure complete cl imlll 'Qi t val e during each operation.

These and other objects, together with their attendant advantages, will be apparent as the invention becomes better understood by reference to the accompanying specificationand drawings forming a part thereof, it being premised that changes may b made in the construction of thevalve within the scope of the appended claims without departing from the spirit of the invention,

Figure 1 is a vert1ca1sect1onthrough a valve constructed in accordance w th the Pre ent nvention.

Fig. 2 is a section corresponding to Fig. 1 showing the valve completely opened; and

Fig. 3 is a cross sectional view on the line III-III of Fig. 2.

Referring more particularly to the drawings, we have illustrated a valve casing 1 having an inlet passage 2 and an outlet passage 4: formed therein. Surmounting the casing is a head member 5 of any desired construction, tightly maintained on the easing by any suitable means.

Passing through the head member 5 is a valve operating stem 6 having a threaded portion 7 for engagement with a corresponding threaded portion in the head. A suitable hand wheel 8, or the like, may be provided for operating the same.

Mounted on the lower enlarged end 9 of the valve stem is a piston valve 10 having a seating face provided with a suitable packing material 11. Any desired means, such as the plug 12 may be utilized for holding the packing in position.

Detachably secured in the valve casing to cooperate with the packing 11 on the valve, is an annular seating member 1 1. In the preferred construction there is provided an annular passage 15 surrounding the seating m m r ch passa e com un c e w a t pen g- 6 ro h h ch t em'unde p ssu e may h adm r. an n th valve or removing sediment from the seat ing the i i a p nin mov me of th valve, 7

It s b e to -m n. ac ua u e th t. in a s' f i tre h re orms an accum lation or deposit of foreign matter in the chamber 17' above the valve. Unless the valve is t e own and the iment removed periodi ally, the operation of the valve is impeded. For-removing this accumulation automatically each time the valve is o erated, we ha e rovided the chamber wi h bv-nasses 18 leading from the inlet pass e 2 into he. upper po tion of the chamber 17. by which steam under ressure is admi ed a all times to the chamber. As soon as the valve is unseated. the exh ust by passes 9 are uncovered at theirl w r ends permitting the fluid. to ether wi h the fore gn mettento pass downwa dl through the outlet passage as indicated by the arrows in Fig. 1. During this time direct communication between the inlet passage and the outlet passage is prevented by the piston valve 10. Continued opening movement of the valve to the position shown in Fig. 2 establishes communication between the inlet and outlet passages in the valve casing, permitting the flow ofwater therethrough.

While we have found that the by-passesor relief passages l8:and exhaust passages-19 will. effectively clean the chamber 17 when employed alone, their operationis materially assisted by combining the same with the steam jet opening 16. Due to the intersection at an angle of thesteam jet opening 16 and the exhaust passages 19, the deposit of any material from the valve chamber upon the valve seat is prevented. This material is held. out of contact with the walls and seat of the valve so that scoring and cutting of the same is prevented, by the combined action of the intersecting jets.

It will be apparent that the specific constructionof the valve casing and of the valve itself, may be changed and constructed in any desired manner to adapt the same for the specific use to which it is to be placed, without affecting the operation of the same or departing from the present invention.

We claim: r

1. A valve casing having-inlet and outlet passages, a valve seat intermediate said passages, and a valve cooperating with said seat, said casing being provided with means controlled by said valvefor cleaning by the action of the fluid from the inlet the portion or, the casing above the valve duringthe opening movement thereof 7 before direct communication between the inlet and outlet passages is established, substantially as described.

2. A valvecasing having inlet and outlet passages, a valve seat intermediate saidpassages, and a valve cooperating with said seat, said casing being provided with means controlled by said valve for simultaneously cleaning by the action of the fluid from the inlet the valve seat and the portion of the casing above the valve during the opening movement thereof before direct communication between the inlet and outlet passages is established, substantially as described.

3. A valve casing having inlet'and outlet passages, a valve seat intermediate said passages, and a valve cooperating with said seat, said casing being provided with means intersecting at an angle and controlled by said valve for cleaning bvthe action of the passing fluid the valve during the opening movement thereof, substantially as described.

4:. A valve casing having inlet. and outlet passages, a valve seat intermediate said passages, and a valve coeperating with said.

seat, said casing having by-passes formed therein and controlled by said valve for cleaning by the action of the passing fluid the portion of the casing above the valve during the opening movement thereof, substantially as described. 7

5. A valve casing having inlet and-outlet passages, a valve seat intermediate said passages, a valve chamber above said seat, avalve in said chamber cooperating with said seat, and means for operating said valve, said chamber being provided with passages controlled by said valve for cleaning by the action of the passing fluid the chamber above the valve during the initial opening movement thereof, substantially as described.

6. A valvecasing having inlet and outlet passages, a valve seat mtermechate sald passages, a valve chamber above said seat, a

valve in said chamber, and means for reciprocating the valve in said chamber, sald chamber being provided with passages controlled by the valve during the initialopening movement thereof before the inlet passage is uncovered. for cleaning by the action of the passing fluid the valve chamber during the initial opening movementof the valve. substantially as I described.

7. A valve casing having inlet andioutlet passages formed therein, a valve seat intermediate said passages. a piston valve cooperating with said seat, and means for operating said valve, said casing being provided with passages communicating with the inlet passage at one end and closed at their exhaust end bv the valve when the same is seated for directing a cleaning jet above the valve during the initial opening movement thereof, substantially as described. V p

'8. A valve casing having inlet and outletpassages. a'valve seat intermediate said passages, and a valveicooperating with said seat, said casing having passages for a plurality of independent intersecting cleaning iets. said passages being controlled by said valve for cleaningbv the action of the passing fluid the valve during the opening movement thereof, substantially as described.

9. A valve casing having inlet and outlet passages. a valve seat intermediate said passages, and a valve cooperating with said seat. said casing having a cleaning passa e communicating at one end with said inlet passage and terminating at its opposite end adiacent said seat, said casing having a sup plemental iet opening adiacent the terminating end of said cleaning passages said passage. and saidiet opening being rendered inoperative-bv said .valve when in closed po si ion. substantiallv'as described.

10. A valve casing having inlet and outlet passagesa valve seat intermediate said passages and below the level of the inlet passage, a valve cooperating with said seat, said 7 casing having a bypass therein communicatpassages, a valve cooperating therewith, and means for bypassing fluid around said valve from the inlet to the outlet during the 15 initial opening movement thereof before direct communication is established between the inlet and outlet, substantially as described.

In testimony whereof, We have hereunto 20 set our hands.

JOHN F. MATTERN. GEORGE M. STONER. 

